Thanks for visiting the Community, @vladimirterehoff. I'm here to help you with your concerns about the currencies in QuickBooks Online (QBO).
At this time, the option to have 2 base currencies in one QBO account is not yet possible. Also, the region of your QBO account will be the same as your base currency.
Furthermore, you can also use the multicurrency feature in QBO to help you record transactions in foreign currencies. To learn more about multicurrency, see this article.
Moreover, when you run a report, it is also possible to display the currency that you used in your transactions.
Additionally, you can check out this article to learn about how you can customize your reports in QuickBooks Online.
I'm still open to your replies if you have additional questions about multicurrency. I’ll get back to make sure you’re taken care of. Have a good one.